Will spotify take money from my bank now?

I was planning to get Spotify premium because I suppose I need it really (can't live without music)
and I have no money in my bank but have just got out of overdraft as well (I'm with Barclays and I was subject to fraud so I never made payments to get overdraft) but I was wondering as it is a free 30 day trial and if you don't cancel your subscription you have to start paying… As I have no money at the moment, will it take ANY money out of my account until the 30 days is done? Also am I correct if I save a playlist or album to offline mode, my iPhone will not use data and I won't be charged by O2?

No it will do it tomorrow
they lazy